The recent addition of Hebrew line breaking rules apparently does not
work with genbrk from ICU 4.6. Maybe we should just require 4.x (where x
is the first version where it is implemented) as minimum ICU version?
IMHO it would be better than this insane (and fragile) filtering...

Change-Id: Ia2adad3621fa7a2f319a07fb569b1f1c1eb6db7c